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Marine Boilers – Marine Engineering Knowledge

October 13, 2015 10:40 am | 1 Comment | Frozee

What is the meaning of marine boilers ?

Boiler is a pressure vessel used on ships in which the water is heated to evaporate and generate the steam and the unit is so arranged that the generated steam accumulated in it. The two main types are water tube and fire tube.

What is the boiler mounting ?

It is directly fitted to the boiler shell. They are:

Safety valve

Main steam stop valve

Air vent cock

Two gauge glass level indicators

Feed check valve

Scum blow down valve

Bottom blow down valve

Salinity cock or test cock

Man hole doors.

Where are air vent cock located and its purpose ?

The air vent cock is fitted at the top of the steam space of the boiler.

Its purpose are-

To release air from the boiler either filling the boiler water or raising the steam.

To allow air to enter in the event of boiler cooling down or blowing down. ( to prevent vacuum effect)

What are the safety arrangements in marine boiler ?

Safety valve

Low / high water level alarm

Too low water level alarm and shut down

Water level indicators

Pressure gauge

Low fuel oil pressure alarm

Low / high fuel oil temperature alarm

Flame failure alarm

Smoke density alarm

Easy gear arrangement

Air vent

Force draught fan stop alarm

Low / high steam pressure alarm

Why need to blow down the gauge glass ?

Gauge glass blow down is made to know the boiler and gauge glass connection is clear or not and to give the exact water level in the boiler.

Boiler gauge glass blow through procedure ?

Shut steam and water cocks than open the drain cock.

After draining water from the sight glass, there is nothing come out, both steam and water cocks are good in order.

Open the steam cock side, blow out the steam.

Close the steam cock side, the steam connection is clear.

Open the water cock side, blow out the water.

Close the water cock side, the water connection is clear.

Close the drain cock.

Open the water cock, water should then gradually come rise up to the top of the gauge glass.

Open the steam cock, the water in the glass should fall to the level of the water in the boiler.

Why need to blow down the boiler water ?

Boiler blow down is made to reduce the density of salt and to remove the dissolved and suspended solids, also the floating solid impurities in the boiler system.

If there are not removed from the boiler water system, foaming, priming, corrosion will occur in the boiler steam space and feed water system.

See ‘Boiler Blow Down’.

Why scum blow down or surface blow down is carried out ?

To remove accumulated, suspended and floating solids, impurities and also remove dissolved solid concentration, they hinder the formation of steam.

Why bottom blow down is carried out ?

To remove suspended solids and residual sludge that have settled at the bottom.

If these contaminants are not removed regularly they will build up until they hinder the circulation patterns.

What is the purpose of boiler water test ?

To ensure that proper chemical treatment are maintained at all time.

To detect the present of contaminants in the water that may be injurious to boiler and system.